Actual range hoods mess with ventilation, so it's easier for builders to stick a recirculating one and not have to worry about ventilation imbalance. There's a

Actual range hoods mess with ventilation, so it's easier for builders to stick a recirculating one and not have to worry about ventilation imbalance. There's also the belief that it will somehow break the main ventilation motor because of the large volume of air forced through it. But it shouldn't actually be a problem.